First Middle Devonian Bivalves from Argentina, New Records from the Punta Negra Formation and Insights on Middle Paleozoic Faunas from the Precordillera Basin

Ameghiniana ◽  
2015 ◽  
Vol 52 (3) ◽  
pp. 334-349 ◽  
Author(s):  
Andrea F. Sterren ◽  
Juan J. Rustán ◽  
María J. Salas
Keyword(s):  
Middle Devonian ◽  
New Records ◽  
Middle Paleozoic

Taxonomic revision of Hyolitha from the middle Paleozoic of North America

1987 ◽  
Vol 61 (6) ◽  
pp. 1173-1186 ◽  
Author(s):  
John M. Malinky ◽  
Robert M. Linsley ◽  
Ellis L. Yochelson
Keyword(s):  
New York ◽  
North America ◽  
Middle Devonian ◽  
New Genus ◽  
Taxonomic Revision ◽  
Type Specimens ◽  
Middle Paleozoic

Collection of over a dozen specimens of Hyolithes aclis Hall from the Middle Devonian of New York indicates that this species belongs to a new genus, Hallotheca, to which the species Hyolithes halli (Hall) is also assigned. However, the generic assignments of the Silurian species Hyolithes cliftonensis Foerste and the Devonian species H. centennialis Barrett, H. ceratophilus Clarke, H. neapolis Clarke, and H. triliratus Hall are uncertain because of poor preservation of their type specimens. Use of these names should be confined to the types until better preserved topotypes become available. Finally, H. cooperi (Williams) consists of organisms of uncertain affinities, and the type of H. principalis Hall may be a fragment of Devonian sandstone rather than an organism.

New records of Devonian plants from southern Victoria Land, Antarctica

1994 ◽  
Vol 131 (1) ◽  
pp. 81-90 ◽  
Author(s):  
S. McLoughlin ◽  
J. A. Long
Keyword(s):  
Middle Devonian ◽  
New Records ◽  
Fossil Plants ◽  
Victoria Land

AbstractAn assemblage of fossil plants is here recorded from the Middle Devonian Beacon Heights Orthoquartzite and overlying Aztec Siltstone (Taylor Group), of the Cook Mountains and Skelton Névé regions, southern Victoria Land, Antarctica. The Beacon Heights Orthoquartzite exposed in the southern Cook Mountains yielded specimens of the lycopods Haplostigma lineare, Malanzania sp., and Archaeosigillaria sp. cf. A. caespitosa. The Aztec Siltstone flora contains Praeramunculus alternatiramus and H. lineare.

Middle Paleozoic paleomagnetism of east Kazakhstan: post-Middle Devonian rotations in a large-scale orocline in the central Ural–Mongol belt

2003 ◽  
Vol 377 (3-4) ◽  
pp. 249-268 ◽  
Author(s):  
Natalia M. Levashova ◽  
Kirill E. Degtyarev ◽  
Mikhail L. Bazhenov ◽  
Adam Q. Collins ◽  
Rob Van der Voo
Keyword(s):  
Middle Devonian ◽  
Large Scale ◽  
East Kazakhstan ◽  
Middle Paleozoic

scholarly journals Hidden Middle Devonian Magmatism of North-Eastern Siberia: Age Constraints from Detrital Zircon U–Pb Data

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 874
Author(s):  
Victoria B. Ershova ◽  
Andrei V. Prokopiev ◽  
Andrei K. Khudoley
Keyword(s):  
Detrital Zircon ◽  
Middle Devonian ◽  
Passive Margin ◽  
Large Igneous Province ◽  
Late Devonian ◽  
Eastern Siberia ◽  
Provenance Analysis ◽  
Fold And Thrust Belt ◽  
North Eastern ◽  
Middle Paleozoic

We present new data on the tectonic evolution of north-eastern Siberia using an integrated provenance analysis based on U–Pb detrital zircon dating and sandstone petrography of Devonian sedimentary strata. Our petrographic data suggest that Upper Devonian sandstones of north-eastern Siberia were derived from a local provenance, supported by the widespread distribution of ca. 1900–2000 Ma magmatic events in the basement of the neighboring Ust’-Lena and Olenek uplifts. Devonian detrital zircon age distributions of the Devonian sandstones are similar to ages of Middle Paleozoic magmatic rocks of Yakutsk-Vilyui large igneous province (LIP). Therefore, we suggest that the studied sandstones were derived from proximally-located uplifted blocks composed of Proterozoic–Devonian rocks and Middle–Late Devonian volcanics. Moreover, the abundance of Middle–Late Devonian zircons is suggestive of a wider distribution of coeval magmatism across north-eastern Siberia than previously supposed. We propose that widespread Devonian magmatism associated with the Yakutsk-Vilyui LIP also occurred to the east of our study area and is now buried beneath thick Carboniferous–Jurassic sedimentary rocks of the eastern Siberian passive margin, subsequently deformed into the Late Jurassic–Cretaceous Verkhoyansk fold-and-thrust belt. We also propose that the major pulse of the Yakutsk-Vilyui LIP occurred in north-eastern Siberia during the Middle Devonian at ca. 390 Ma, some 15 million years earlier than within the Vilyui rift basin in eastern Siberia (ca. 375 Ma).

Malluviospongia, a new Devonian heteractinid sponge from the Bird Fiord Formation of southwestern Ellesmere Island, Northwest Territories, Canada

1986 ◽  
Vol 23 (3) ◽  
pp. 344-349 ◽  
Author(s):  
J. Keith Rigby ◽  
Q. H. Goodbody
Keyword(s):  
Northwest Territories ◽  
Middle Devonian ◽  
Middle Part ◽  
Ellesmere Island ◽  
Calcareous Sponge ◽  
Middle Paleozoic

The new heteractinid calcareous sponge Maluviospongia densa occurs at two levels in the middle part of the Lower to Middle Devonian Bird Fiord Formation near Goose Fiord and Baad Fiord in southwestern Ellesmere Island. These occurrences further document that Canada was a principal center of heteractinid evolution during the early and middle Paleozoic. The small, stalked to bowl-shaped sponges have canaled skeletons of irregularly oriented, though size-ranked, octactines that are enlarged to lumpy, grotesque elements in the inner endosomal part of the wall.

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